Finding the Fourth Proportional to 3,899.60, 5,379.78 and 2,406.37

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899.60 : 5,379.78 = 2,406.37 : x
2. Step 2: Convert to fraction form
   3,899.60/5,379.78 = 2,406.37/x
3. Step 3: Cross multiply
   3,899.60x = 5,379.78 × 2,406.37
4. Step 4: Simplify right side
   3,899.60x = 12,945,741.20
5. Step 5: Solve for x
   x = 12,945,741.20/3,899.60
6. Step 6: Final answer
   x = 3,319.76